28
HEATING ENGINEER
The flue gas exhaust and its connection to the stack must be made in compliance with applicable laws and standards,
using heat resistant, condensate resistant and stress resistant rigid pipe and sealed joints.
b
The stack must guarantee the minimum draught
specified by applicable technical standards, assu-
ming zero pressure at the connection to the flue gas
exhaust.
b
Inadequate or badly dimensioned stacks and
exhausts can increase combustion noise, cause
condensation problems and affect combustion
parameters.
b
Uninsulated flues are potentially dangerous and can
cause burns.
b
Joints must be sealed using materials capable of
withstanding temperatures of at least 200°C (e.g.
filler, mastic or silicone based sealant).
DIMENSION
(mm)
RTQ 3S
91
115 166 217 255 318 349 448 511 575 639 766 896 1100 1300 1600 2100 2400
Ø
179 180 180 200 200 250 250 300 300 300 300 350 400 400 450 500 500 500
H
384 500 525 525 525 550 550 655 655 690 690 715 755 820 865 900 1000 1000
H2
1010
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H
0
30
60
90
Ø
Ø
H
H2
Typical installation schematic
Typical installation schematic
RTQ 91 3S
RTQ 115÷2400 3S
D
3÷5 D
b
A sensor socket must be positioned at a distance of 3 to 5 times the diameter of the water return pipe, upstream
from the water fitting, to measure effective water return temperature and control the anti-condensate pump or the
temperature controller stabilisation function.
b
Any temperature controllers installed remotely from the control panel must be compatible with the system’s electrical
connections and functioning logic.
An anti-condensate pump operates during periods of no
heat request to avoid damage until the boiler returns to
a stable operating temperature. While the system is ope-
rating, this pump must guarantee a flow rate between 20
and 30% of maximum flow, must ensure a water return
temperature no lower than the minimum permissible (see
technical data) and must also delay shutting down for at
least 3 minutes at the beginning of extended periods of
boiler shutdown (overnight or weekend shutdown etc.).
Combustion gas exhaust
COMBUSTION GAS EXHAUST
Anti-condensate pump
ANTI-CONDENSATE PUMP
